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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc64a5903ed100afa4b938c325c64c50d34de668d5a23d577b9abceb99970df5' 
  AND token = 'lx/r2AjOuOnbwnuZAOe4i9Zl3XHNPRPA6D7AdWhSWsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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