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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5d4fdbf7f8694421d05c9f1ae7d5d11c8db4ce15b9d038094412f422b95940' 
  AND token = '2y1BuyGGqUSvYmROEUxgh8VB0fd+vyRU3e4PXN/XVzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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