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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce62183214c68d69be36b9dc50b0b4d0c51bf382bfc81d48698e28db5d9a5f3' 
  AND token = 'uJTmYL8hBHrqo/BE53AxH4Dmjw+w6As4ZH1tdeLcFw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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