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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87dd42a117973a0c40f3b26adae90931e61cf2fd78d127934cdb8e4b46a2e7d6' 
  AND token = 'WSHsR279t+DB3UYkmltWZwbjWIG9BSOFa/bd0zd9YFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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