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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d4bec95a00224342dacfcae7999fa320746539a5d8a2feb7a43f788355124c9' 
  AND token = 'jKyt2Qd992D0hYtAB7RAN+pNQK+qNQ3sOmH3b6rdtuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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