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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f81276645fc2fa1c031d821c17e9f9503d85b68987e7d6c0eb0fd8004dccef' 
  AND token = '/55EhzhR/AdITr45aLeu0uQQTIUJ/lrjhllF5XHRbOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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