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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '082c3c817ffb656e4a03a376c5f4bdb7d459654b3995d5095ecc9b177f9b1a07' 
  AND token = 'd97VZeyU3gfOAZqIHMq7vDw+j1QLlQEm5xoO5uL2wZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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