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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94bc1ae199e300f39c72af9788e6a27ec2425ddba40bfe01da834e3c53e75dcc' 
  AND token = 'Vi3YmtLPwwu5XQSLbxJg3+MEthOzf/VJH6OE/jaxc8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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