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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e8f11dd19fddc4901d58bff5c3d6202f3a8b3bab4c690c07dd171dc93f90e6' 
  AND token = '7kFJYwBPYT26iuP6aeY0TTBT3xkzv1/Fam2ZNz3GgPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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