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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd766e7c30be4ec04434578d09049e96471cc33f51b095ea737a1cf226c7cfa' 
  AND token = 'K4TseHR6/tSVL2jszpmgWdmn1sCPMg9DVC/jZfdjZNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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