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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c86a559c5092fcb01201fe708b5b5dcb5bce8f6e9cb9b4159453e9e3c3f1173' 
  AND token = 'cJgh2RYGorZ9Cp4r7itM2lTIq/ZL4dK1UWNkyHeYHBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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