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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53db4296a3fd6ef1c1ad8eab685777eda989600ea685b8372a0919d1ad0464f1' 
  AND token = 'SDNi2capLIsst9TBr2r92zeuh+dkTeO+LhJFKwJkCgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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