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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4758eebe8144bc91c33aa1a691346a8a08196e329d643b6fc0ea677a3b152d2' 
  AND token = 'fpUT7klFsxppHiWRO9YnPnuH2msnzWrXpzzpXcxw3e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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