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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886b4bfe0e04913800c5cf8b68d2cb52435ad151a5b6f8b412b061a263f95bea' 
  AND token = 'sUy4DmZLjQ4TwjGSA3oIWE34aykFwb4JF4U8Y+Ck05I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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