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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55e1f6a323acefe0ad46625da6f34013ccbbf31912c2e9361cccc2bc12a22e57' 
  AND token = 'hrNosg4wwVnwUtUp7BZ3/1kA9Mpxmfrzp2e869Sqcl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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