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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c5f837ac221b91c06f063a20add997a1bb3adf67c61bdfa17b75ba8b41e67b' 
  AND token = 'vqMv9abyuJdC0BB1glWb8ENcSh9zU/TrmA7UxiP18x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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