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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6005591ad0d4957dd732c42a25e5fbf1463ab6530ce8e1ae4c31572cd86d34f' 
  AND token = 'ZP2hWxd3ycLVa55UPRXvHIiMSenVriohbs+WwtO/Xr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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