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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa24c636928a71e1dfc11afc943abaa0349e886113ab3227544a9ec9060d30d' 
  AND token = '8AUX7sDXiwx96dPGe1eF2AFOpFl4ysq4uszF4fVCxO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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