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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7299928084509bb84113ec1876663e2a06ad6e034a126a87529483c90bb3a285' 
  AND token = 'Vcs1dj7xL3PLP4yD+6XyEsnZy3s8CQb0IdC6VlgrQU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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