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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83073b8eef81a6b1c6915a928f30b8dd33895cc75d49ed772e94e26336f7a59' 
  AND token = '4UFn2sYIk81b5VyZpJ/3OxPLuofRECIUiCY/p/8/+RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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