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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58cfdb77452a85e9cf903fdf26d1b357113ee12e7e998db2045ae5e73942e8a0' 
  AND token = '3q2W3HnH5T1md1lHS8PY5b1ifA3k5sSBAJvrzr5y57o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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