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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88c7f20addb7a37722c803f3a1b0105e689984ce1645f442efdb533ed30dbdc6' 
  AND token = 'KIaskBGfjTrmbJCdH8vnRULRKkh0LIvv7G4L6RpFJ08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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