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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab84df2ce462ee47ca1fd319e0955d872799cfc1e114e4bb923106be761b0f8a' 
  AND token = 'PJuBLV+hTYVuRr8Ixl7eOVvcZskx7OJ2fVcfpUalsDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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