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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7998251366d3c832247c98495c9d440510bacb8c11789c362d460bb7fb0ecdb' 
  AND token = '5z73TED0YIKb6K/sudtWXCzi4/CPvd3anWOOjPuf0e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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