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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca75e4efcf74277efa43229225919d90e04d2d1f1029b1c4ce93a58a12ad272' 
  AND token = 'tx6kxgh10fP33SBKtKoOTf7KzmdtRYfoBClWyBdKLdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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