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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8349d2a64953d936d0b3edcd522970dc01028f6c4881f6d70f760d4f422e8647' 
  AND token = 'SU6x26vG1D9+G/xMKAfwZ2Wp77mR2t0AtWZHab1piGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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