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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d4313cb5d5b20f47ea1a281de669f8b11cbc78db77ffca3b6357603c8878d48' 
  AND token = 'fZvzZrN2QKixzjFbAd0glkgeFz+CnB9v9S30Z3TAELY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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