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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14e64af8015340db07b0289892b6f8bd42c33b270b1fa122affd8b1a64d8143' 
  AND token = 'wWeMo1qkShMROpXI7Us4bxzIldsZWAPK8xsw2nQcrqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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