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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ca3f1e64db5b65f7e3028aeaf9f0a9f5d113f21d1a1a6bbd91b9ffd3af111b' 
  AND token = 'LdvfqoKZLFpk62KC5yzDOy/15Xicp1Qic4IxVoHAtwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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