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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d19a7631b2b57f8b7fa98ebd7ab1b5c7130437ba185c5df640ec6a76b9fe41a' 
  AND token = 'BEdpuTAV07Plf011/i6t06Ce+EoeXZFjhgJS/C6OCkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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