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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b19d477ba17145fd5ed776f56e25e3c4767d097f069e0bf71e927501e381ab' 
  AND token = 'nSKFoFIW0GRurwW9i7XHMgHdbSKj/q8EWVh5gb8yZE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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