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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c252705c1df2c99923bcd741eacb3ea960eaa79e79334907770d73e8df02d85' 
  AND token = 'cAIuJMsSs/ZRDLQVWSNm5fPCBhg0H3W9kZS7Vk8W/mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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