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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c546badd3e29ef6f0cac6704130b0a0c438b4d801cc25ff9c076dc265377bf8e' 
  AND token = 'BjRpSuLi5Sa+1JXcyv1cyshkyq6RiWfirwtIowayKis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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