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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a90509031d798d33ed3fdbe6aa2cf688065cd479451b5c993c7763570f70db' 
  AND token = 'dsKfdPM9TBH31fjVTviE5etLHEitAKBEMV3ZR8xfwyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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