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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76423d09337b5c42d2dde34a1028a3cdaafd8f608647ee1c967bb301bf2239ca' 
  AND token = 'qPo/X39YKo2rPuG05HPFBIUzmPLem89rWinJPdgoU1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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