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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54cd5267507e308649b0ef68bd4c80bd1ed0c2b4cf597d42cdb0f261fdb6f59' 
  AND token = 'IXaF7eA5jdRHRRaUDi3vXH90r+J/SCEXUWrjL0j7GXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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