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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9837984aad1400052fd1950c12ec4a4702b0981c94a6da4f17671e2c1c86910c' 
  AND token = '0EnQaCz79OQ272fVul0/blm+ux6YTSP9svs5m7sgCgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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