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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a740491f20175013a4d8ab536d0e637a597682f9ea6b1269db8178c43e9f50' 
  AND token = 'qssIRJ3He7d0tNut1AMe0n9IgtI59Mc0rz+Ni87CHjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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