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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e119614d1964002979f4a06836f921ed2a5f782e7c4e1ffa6cf30962a954ef0' 
  AND token = 'S5dvk+vqZK59d46Im7dpAs/Ws+yMmRqThpdX29jhAV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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