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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b438f79cb15e9b6e25ba67b959a1bae42f2b2bd62cb6824c818b3eea1e600b1' 
  AND token = 'jO7k1iJPetK9xkjvl++7jclCw+GjU7d71aF6s5Dprtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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