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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd59da232bc2c395be309c6b30bbb24a65ca2dce2ac874aff2c9fde67d79557dc' 
  AND token = 'FNH1ts1ArOHyHCjKLQikqKA2eztepraA0BBkhmyevq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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