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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75da2c581c878c5392162e869b51eb9d1a0bdc2c1d4dea955594b6fc6f0a96ed' 
  AND token = 'cdcKbcyFJMIi/urYGnur8wxeatT1CvihMkwVBjnv7wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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