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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3513ec1030b66a3139cde99a5dd2ed2d013cf6dcb823bf1e8caf07acf9340fa3' 
  AND token = 'nSCdq1ua76L+6l70/M+z6AiLxLTEOiGaulWC+RI30QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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