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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fd4ca418d5cc8da1e1687ca495d50c526f4ab96ed23b31a7ceb31387d6a241' 
  AND token = '/TwhLf03QQ/6ETmXa8dRGGhUB5w7NxFGW4oi1Aa69qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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