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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475f49466a7dce38e0aeec37da64ffe98c13c93b52a1e3a35c79c5ec000a350e' 
  AND token = '+mYO/69werEYOQUNh+hYr/KlWbMDoyzk37WXE/X/j1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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