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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af95abfb95626642a7a7b60553b1294a95027ad947de3905952d7310012ff47' 
  AND token = '/6DaHBE0QPSpnmVT4XTXEnZUSLZWy0buY3J25J0bz1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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