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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1697b282ba2e9e18f40b6120e3dd4a64c92845001ebf33961b055cdfbe90fc3b' 
  AND token = 'HgdCaDMu22BPn/5fAlXAIoq+kudQODKsSQe7n2CXRoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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