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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '485109da6060911a1d9fe2f8d44e16d8f7b997830440a4402dbbb738a095d284' 
  AND token = 'M1T8G2luS4LhUNRSLPfYakeUAh2UPnb8+3X3nbalPG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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