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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62a194b187e2952af0c62f2e32128efc48f184b6b3bd8c5b94caccdb31b1c40' 
  AND token = 'Mnkll7crjLcJMTE/H5+Z5auZVRWoPTi1FnNe7FVjfKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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