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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dcd8cdd463c5ac91a5dc85d22212d85b33c2a6c46d9724552b49cb907a87730' 
  AND token = 'wnACrDkWCSSpoks4S4q7im+9C7awYiaZXh/NwQjQaJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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