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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c984b62bb2fe601bba2666a14176de84d4ed3d9231036e58cac9672f07d5bb2a' 
  AND token = 'rnWexTU89yMMlKlfRJiQ6gmSLjJFG3SrrYV1ZwaZyGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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