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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefec774eff0b755695fef6caa34804ece2eaee226fbd4011791c3a2a965f806' 
  AND token = 'eoP0Aa6lxyAT7nCmIYweNX0GO+plXzE+Xqek/9jDezg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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