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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb11c3dfae1e433c8fcaaa7aa8234bb4a48980ae40c0571885ee70b51e05dac' 
  AND token = 'f7wwVsFN/ExfL1r6pxRJT7oAb/ZiQaIl61AG3z/bQrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}