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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93a7ed885f2db09f28b7bc521df6388a0927dcb0e0744851f67297a2581089d' 
  AND token = 'I130bBoicNUmeAmvueNeO9SfTph4LHG5gPOhfppPxc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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