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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023a33a92e59d4065c347eb962bf7f804aedca7c0bedff89505264e9f63c9b90' 
  AND token = '2ISRqble3nd4z9seKXoE3WSUnCVQyf2ky/0kuMFUhIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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