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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5aba5b5866ef6de6192ff41aa72016166d9aae17f9355a2578fa402a74466a6' 
  AND token = 'z5i7j6m1EyDWfpQ1R4NvcDhSKoqgF3HdWICmVXBa6aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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