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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f64976bed6ae3cea7acdb4e9fb29bbb1f45bdab89c60e6c930f09fa0d5b2dbbb' 
  AND token = 'jPP0Bjpcm10a1c1n8sypZvl+3imgg+caRwM7WemTD6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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