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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a26c30acf6d5c0d02faa42293729f1c11f5e7d21890875b758c473ddf66fb9d' 
  AND token = '/iaWkwt4hrokj6Hn9W+wNK6SQ53moDBZtxTV9YkRfr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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