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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e74cda98f0d845f1d5e0947372eddb5a8e4ec7380fa0881c55a6a35cdcce3f' 
  AND token = 'OdgRQ6xgS7r/BC/kB57KI1YP1kbfACSLfyBTh3pk0jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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