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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403c26aa6f035a7edfcce80a3849348d23260db6f0cc6f910e71825ccd6553ca' 
  AND token = 'TyU6C/Qclgzgt86zzfi+MybI7p3RTuuQMIwF1cSvrUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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